homescreen: Support for bound_ok and bound_fail events

This adds support for version 2 of the protocol, but to also
provide an example for other clients how to use it.

Bug-AGL: SPEC-4502
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I710026bf293280d7aec2aa5d6e4528965840e23c

1 files changed, 74 insertions, 8 deletions

diff --git a/homescreen/src/main.cpp b/homescreen/src/main.cpp
index 2c2f7c0..4a13607 100644
--- a/homescreen/src/main.cpp
+++ b/homescreen/src/main.cpp
@@ -32,9 +32,16 @@
 #include "wayland-agl-shell-desktop-client-protocol.h"
 #include "shell.h"
 
+#ifndef MIN
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+
 struct shell_data {
 	struct agl_shell *shell;
 	struct agl_shell_desktop *shell_desktop;
+	bool wait_for_bound;
+	bool bound_ok;
+	int ver;
 };
 
 static void
@@ -62,6 +69,31 @@ agl_shell_desktop_state_app(void *data,
 		homescreenHandler->deactivateApp(app_id);
 }
 
+static void
+agl_shell_bound_ok(void *data, struct agl_shell *agl_shell)
+{
+	struct shell_data *shell_data = static_cast<struct shell_data *>(data);
+	shell_data->wait_for_bound = false;
+
+	shell_data->bound_ok = true;
+}
+
+static void
+agl_shell_bound_fail(void *data, struct agl_shell *agl_shell)
+{
+	struct shell_data *shell_data = static_cast<struct shell_data *>(data);
+	shell_data->wait_for_bound = false;
+
+	shell_data->bound_ok = false;
+}
+
+#ifdef AGL_SHELL_BOUND_OK_SINCE_VERSION
+static const struct agl_shell_listener shell_listener = {
+	agl_shell_bound_ok,
+	agl_shell_bound_fail,
+};
+#endif
+
 static const struct agl_shell_desktop_listener shell_desktop_listener = {
    agl_shell_desktop_application,
    agl_shell_desktop_state_app
@@ -69,7 +101,7 @@ static const struct agl_shell_desktop_listener shell_desktop_listener = {
 
 static void
 global_add(void *data, struct wl_registry *reg, uint32_t name,
-	   const char *interface, uint32_t)
+	   const char *interface, uint32_t ver)
 {
 	struct shell_data *shell_data = static_cast<struct shell_data *>(data);
 
@@ -77,9 +109,20 @@ global_add(void *data, struct wl_registry *reg, uint32_t name,
 		return;
 
 	if (strcmp(interface, agl_shell_interface.name) == 0) {
-		shell_data->shell = static_cast<struct agl_shell *>(
-			wl_registry_bind(reg, name, &agl_shell_interface, 1)
-		);
+		if (ver >= 2) {
+			shell_data->shell =
+				static_cast<struct agl_shell *>(
+					wl_registry_bind(reg, name, &agl_shell_interface, MIN(2, ver)));
+#ifdef AGL_SHELL_BOUND_OK_SINCE_VERSION
+			agl_shell_add_listener(shell_data->shell, &shell_listener, data);
+#endif
+		} else {
+			shell_data->shell =
+				static_cast<struct agl_shell *>(
+					wl_registry_bind(reg, name, &agl_shell_interface, 1));
+		}
+		shell_data->ver = ver;
+
 	}
 
 	if (strcmp(interface, agl_shell_desktop_interface.name) == 0) {
@@ -117,6 +160,14 @@ getWlOutput(QPlatformNativeInterface *native, QScreen *screen)
 	return static_cast<struct ::wl_output*>(output);
 }
 
+static struct wl_display *
+getWlDisplay(QPlatformNativeInterface *native)
+{
+       return static_cast<struct wl_display *>(
+               native->nativeResourceForIntegration("display")
+       );
+}
+
 
 static void
 register_agl_shell(QPlatformNativeInterface *native, struct shell_data *shell_data)
@@ -124,9 +175,7 @@ register_agl_shell(QPlatformNativeInterface *native, struct shell_data *shell_da
 	struct wl_display *wl;
 	struct wl_registry *registry;
 
-	wl = static_cast<struct wl_display *>(
-			native->nativeResourceForIntegration("display")
-	);
+	wl = getWlDisplay(native);
 	registry = wl_display_get_registry(wl);
 
 	wl_registry_add_listener(registry, &registry_listener, shell_data);
@@ -248,7 +297,8 @@ int main(int argc, char *argv[])
 	QGuiApplication app(argc, argv);
 	const char *screen_name;
 	bool is_demo_val = false;
-	struct shell_data shell_data = { nullptr, nullptr };
+	int ret = 0;
+	struct shell_data shell_data = { nullptr, nullptr, true, false, 0 };
 
 	QPlatformNativeInterface *native = qApp->platformNativeInterface();
 	screen_name = getenv("HOMESCREEN_START_SCREEN");
@@ -277,6 +327,22 @@ int main(int argc, char *argv[])
 		exit(EXIT_FAILURE);
 	}
 
+	qDebug() << "agl-shell interface is at version " << shell_data.ver;
+	if (shell_data.ver >= 2) {
+		while (ret != -1 && shell_data.wait_for_bound) {
+			ret = wl_display_dispatch(getWlDisplay(native));
+
+			if (shell_data.wait_for_bound)
+				continue;
+		}
+
+		if (!shell_data.bound_ok) {
+			qInfo() << "agl_shell extension already in use by other shell client.";
+			exit(EXIT_FAILURE);
+		}
+	}
+
+
 	std::shared_ptr<struct agl_shell> agl_shell{shell_data.shell, agl_shell_destroy};
 	Shell *aglShell = new Shell(agl_shell, &app);